The format string consists from whitespace characters, non-whitespace characters (except %) and conversion specifications. Each conversion specification begins with % character and contains a conversion format specifier. The following format specifiers are available:
Conversion
specifier
| Explanation
| Used fields
|
| %
| writes literal %. The full conversion specification must be %%.
|
|
| n
| writes newline character
|
|
| t
| writes horizontal tab character
|
|
| Year
|
| Y
| writes year as a 4 digit decimal number
| tm_year
|
| y
| writes last 2 digits of year as a decimal number (range [00,99])
| tm_year
|
| G
| writes ISO 8601 week-based year, i.e. the year that contains the specified week.
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
| tm_year, tm_wday, tm_yday
|
| g
| writes last 2 digits of ISO 8601 week-based year, i.e. the year that contains the specified week (range [00,99]).
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
| tm_year, tm_wday, tm_yday
|
| Month
|
| b
| writes abbreviated month name, e.g. Oct (locale dependent)
| tm_mon
|
| B
| writes full month name, e.g. October (locale dependent)
| tm_mon
|
| m
| writes month as a decimal number (range [01,12])
| tm_mon
|
| Week
|
| U
| writes week of the year as a decimal number (Sunday is the first day of the week) (range [00,60])
| tm_year, tm_wday, tm_yday
|
| W
| writes week of the year as a decimal number (Monday is the first day of the week) (range [00,60])
| tm_year, tm_wday, tm_yday
|
| V
| writes ISO 8601 week of the year (range [01,53]).
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
| tm_year, tm_wday, tm_yday
|
| Day of the year/month
|
| j
| writes day of the year as a decimal number (range [001,366])
| tm_yday
|
| d
| writes day of the month as a decimal number (range [01,31])
| tm_mday
|
| h
| equivalent to "%d"
| tm_mday
|
| e
| writes day of the month as a decimal number (range [1,31]).
Single digit is preceded by a space.
| tm_mday
|
| j
| writes day of the year as a decimal number (range [001,366])
| tm_yday
|
| Day of the week
|
| a
| writes abbreviated weekday name, e.g. Fri (locale dependent)
| tm_wday
|
| A
| writes full weekday name, e.g. Friday (locale dependent)
| tm_wday
|
| u
| writes weekday as a decimal number, where Monday is 1 (ISO 8601 format) (range [1-7])
| tm_wday
|
| w
| writes weekday as a decimal number, where Sunday is 0 (range [0-6])
| tm_wday
|
| Hour, minute, second
|
| H
| writes hour as a decimal number, 24 hour clock (range [00-23])
| tm_hour
|
| I
| writes hour as a decimal number, 12 hour clock (range [01,12])
| tm_hour
|
| M
| writes minute as a decimal number (range [00,59])
| tm_min
|
| S
| writes second as a decimal number (range [00,60])
| tm_sec
|
| Other
|
| c
| writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010 (locale dependent)
| all
|
| x
| writes localized date representation (locale dependent)
| all
|
| X
| writes localized time representation (locale dependent)
| all
|
| D
| equivalent to "%m/%d/%y"
| tm_mon, tm_mday, tm_year
|
| F
| equivalent to "%Y-%m-%d" (the ISO 8601 date format)
| tm_mon, tm_mday, tm_year
|
| r
| writes localized 12-hour clock time (locale dependent)
| tm_hour, tm_min, tm_sec
|
| R
| equivalent to "%H:%M"
| tm_hour, tm_min
|
| T
| equivalent to "%H:%M:%S" (the ISO 8601 time format)
| tm_hour, tm_min, tm_sec
|
| p
| writes localized a.m. or p.m. (locale dependent)
| tm_hour
|
| z
| writes offset from UTC in the ISO 8601 format (e.g. -0430), or no characters if the time zone information is not available
| tm_isdst
|
| Z
| writes time zone name or abbreviation, or no characters if the time zone information is not available (locale dependent)
| tm_isdst
|
